Question 1

Which of the following statements about atoms is INCORRECT?

Accepted Answer

Atoms are manufactured in plants, and in humans during pregnancy.

Question 2

Which of the following best describes an element?

Accepted Answer

A material made of only one kind of atom.

Question 3

A neutral atom of carbon has an atomic number of 6. How many electrons does it have?

Accepted Answer

$$6$$

Question 4

An atom has an atomic number of $$44$$ and a mass number of $$100. $$How many neutrons does it have?

Accepted Answer

$$56$$

Question 5

Which of the following is true about isotopes?

Accepted Answer

They have the same number of protons but different numbers of neutrons.

Question 6

Which atom is larger: a lithium atom or a fluorine atom?

Accepted Answer

A lithium atom

Question 7

What is the main reason that electrons in an atom do not collapse into the nucleus?

Accepted Answer

Electrons can only lose specific amounts of energy, corresponding to transitions between discrete energy levels.

Question 8

Which of the following best describes the quantum hypothesis as proposed by Max Planck?

Accepted Answer

Energy is emitted in discrete bundles called quanta, each proportional to the frequency of radiation.

Question 9

According to the relationship $$E \sim f$$, what does $$E$$ represent?

Accepted Answer

The energy of the photon.

Question 10

Which color of visible light has the greatest energy per photon?

Accepted Answer

Blue light

Question 11

Why does the hydrogen atom, despite having only one electron, produce many spectral lines?

Accepted Answer

The electron can be boosted to many different energy levels.

Question 12

What happens when an atom is excited?

Accepted Answer

Its electrons are boosted to higher energy levels.

Question 13

Which of the following is a quantum number for an electron in an atom?

Accepted Answer

$$2$$

Question 14

Which of the following best explains why only certain energy levels are allowed for electrons in atoms?

Accepted Answer

Only an integral number of standing electron waves can fit in the shell of the atom.

Question 15

A sodium atom has an atomic number of $$11$$ and a mass number of $$23. $$How many neutrons does it have?

Accepted Answer

$$12$$

Question 16

Which of the following statements about the periodic table is correct?

Accepted Answer

Each vertical column is called a group, and each horizontal row is called a period.

Question 17

Which of the following best describes the atomic spectrum of an element?

Accepted Answer

A pattern of discrete frequencies of light unique to each element.

Question 18

Which of the following photons has the smallest energy?

Accepted Answer

Infrared

Question 19

In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?

Accepted Answer

A photon is emitted with energy equal to the difference between the two levels.

Question 20

Which of the following is a correct statement about the mass of protons and neutrons?

Accepted Answer

Protons and neutrons have about the same mass, which is much greater than that of electrons.

Atoms and the Periodic Table: Structure, Properties, and Quantum Models

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